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<span class="a2a_kit a2a_kit_size_32 addtoany_list" data-a2a-url="https://www.nibib.nih.gov/news-events/newsroom/deep-learning-builds-better-medical-images-ultra-fast-speeds" data-a2a-title="Deep learning builds better medical images at ultra-fast speeds"><a class="a2a_button_email"><span class="a2a_svg a2a_s_a2a a2a_s_email a2a-box"><img src="/themes/custom/nibib/assets/img/email-a2a.svg" border="0" alt="Facebook" width="27" height="27"></span></a><a class="a2a_button_facebook"><span class="a2a_svg a2a_s_a2a a2a_s_facebook a2a-box"><img src="/themes/custom/nibib/assets/img/facebook-a2a.svg" border="0" alt="Facebook" width="27" height="27"></span></a><a class="a2a_button_linkedin"><span class="a2a_svg a2a_s_a2a a2a_s_linkedin a2a-box"><img src="/themes/custom/nibib/assets/img/linkedin-a2a.svg" border="0" alt="Facebook" width="27" height="27"></span></a><a class="a2a_button_twitter"><span class="a2a_svg a2a_s_a2a a2a_s_x a2a-box"><img src="/themes/custom/nibib/assets/img/x-a2a.svg" border="0" alt="Facebook" width="27" height="27"></span
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<span>Deep learning builds better medical images at ultra-fast speeds</span>
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<article data-history-node-id="106226" about="/news-events/newsroom/deep-learning-builds-better-medical-images-ultra-fast-speeds" class="news node node--type-news is-promoted full clearfix">
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<div class="field field--name-field-publication-date field--type-datetime field--label-hidden field__item">July 18, 2019</div>
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<h3>Media Contacts</h3>
<p>Patricia Wiley<br/>
<a href="mailto:nibibpress@mail.nih.gov">nibibpress@mail.nih.gov</a><br/>
<a href="tel:301-496-3500">301-496-3500</a><br/>
<a href="/more-content-by/patricia-wiley">More by this author</a></p>
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<div class="field field--name-body field--type-text-with-summary field--label-hidden field__item"><p>NIBIB-funded researchers are constructing macroscopic medical images of cells and tissues at speeds 7,000 times faster than current methods allow, using a deep learning approach. Producing high-quality, real-time, macroscopic molecular images could enable medical experts to make better, more informed clinical diagnoses. The new technique, by a team at Rensselaer Polytechnic Institute, may produce better images of living organisms in real-time.</p>
<figure role="group" class="align-left">
<img alt="comparison of lifetime map between NetFLICS and TVRecon in mouse" data-entity-type="file" data-entity-uuid="e316e1ab-23bc-4053-a78f-027a75efc6e9" height="211" src="/sites/default/files/inline-images/Comparison-of-intensity-and-lifetime-between-NetFLICS-and-TVRecon-in-mouse-lifetime-only.585x320.slider.jpg" width="345"></p>
<figcaption>Lifetime reconstruction maps of a mouse liver and bladder compare two image reconstruction methods. The new Net-FLICS technique appears on the left side and the current reconstruction method, TVRecon is displayed on the right side. The Net-FLICS method allows images to be built 7,000 times faster than older methods. This figure was adapted.&nbsp;<em>Credit: Intes Laboratory, Rensselaer Polytechnic Institute </em></figcaption>
</figure>
<p>Molecular imaging allows medical experts to observe a detailed picture of what is happening inside a persons cells and tissues by exploiting various traits of molecules associated with a disease, also known as biomarkers. In optical imaging, scientists attach fluorescent tags to the biomarkers.</p>
<p>They can simultaneously monitor multiple biomarkers by varying the fluorescent colors bound to each one, so they are easy to differentiate from one another. With this technique, they can measure the length of time a molecule stays glowing or in an excited state, defined as lifetime.&nbsp; Measuring the lifetime of a molecule can be useful for monitoring drug delivery or the environment immediately surrounding the molecule (microenvironment).</p>
<p>The length of time it takes for data-processing “is one of the main barriers in measuring the lifetime of multiple fluorescent biomarkers, especially for clinical applications,” said Behrouz Shabestari, Ph.D., director of the NIBIB program in Artificial Intelligence, Machine Learning, and Deep Learning.&nbsp; “Developments in artificial intelligence in biomedical imaging, especially deep learning, are beginning to significantly improve image quality and speed up processing times.”</p>
<p>Deep learning is a subset of machine learning that is an assembly of artificial neural networks, often compared to the human brain. A network consists of many nodes, loosely akin to neurons in the brain. An assigned weight amplifies or reduces input from a node, depending on the assigned task.</p>
<p>Pingkun Yan, Ph.D., co-director of the Biomedical Imaging Center at Rensselaer explained, “Nodes are the sites where computation takes place they are like filters in convolutional neural networks.” &nbsp;He described convolutional neural networks as many layers of nodes that are stacked together, and data is fed through the network one layer at a time; but, like neurons in your brain, not every node is activated for each task. The network must be trained with a large amount of data to be successful at processing information.</p>
<figure role="group" class="align-right">
<img alt="comparison of intensity and lifetime maps between TVRecon and NetFLICS methods" data-entity-type="file" data-entity-uuid="2467c5dc-cc74-4550-9508-d32f35a035c5" height="347" src="/sites/default/files/inline-images/Comparison%20of%20intensity%20and%20lifetime%20between%20NetFLICS%20and%20TVRecon.444x402.body_.png" width="383"></p>
<figcaption>Fluorescence intensity and lifetime comparison of Net-FLICS and TVRecon methods. The Net-FLICS method is approximately four orders of magnitude faster than previous methods, and improved the quality of images. It also provides less variation in the intensity and lifetime maps. <em>Credit: Intes Laboratory, Rensselaer Polytechnic Institute</em></figcaption>
</figure>
<p>Deep learning has been applied to biomedical imaging to improve the quality of an existing image for improved clinical diagnosis. “But what our team is working towards is unique; we are using deep learning to execute the physics behind the original construction of the image,” explained Xavier Intes, Ph.D., co-director of the Biomedical Imaging Center at Rensselaer and the corresponding author of the paper published in the Nature journal <em>Light: Science and Applications</em>.</p>
<p>Building upon a previous approach developed by the same team, the new technique called Net-FLICS (fluorescence lifetime imaging with compressed sensing), uses deep learning to construct an image from a small number of point measurements.</p>
<p>Intes and Yans team created an entirely new deep learning network to build molecular images. Often, a network that is exceptional at identifying images in a google search can be slightly adapted for similar applications like facial recognition; this process is called transfer learning. “There wasnt an existing network for our specific application, so we had to take pieces of other networks to build what we needed,” said Yan.</p>
<p>The researchers trained the network using simulations and computer models to generate a large amount of data. Using models gave the team an enormous advantage they had access to an infinite amount of data, which is a common obstacle in training a network.</p>
<p>However, there are challenges to working with a new network. “Its hard to comprehend what occurs inside a brand-new network like ours its kind of like a black box. As we continue to learn more, it will become clearer why the network makes certain decisions, and we can improve it,” explained Intes.</p>
<p>The significant advantages of Net-FLICS allow images to be acquired in almost real-time, opening new doors to researchers and clinicians due to the improved speed and quality of images. Future applications of the Net-FLICS technique will help identify which individual cells show uptake of drug treatment, and which ones do not. Real-time molecular imaging could also aid surgeons while performing complicated procedures like removing a tumor or working around delicate nerves.</p>
<p>This work was supported by the National Institutes of Health Grants R01 EB19443 and R01 CA207725.</p>
<p>Yao R, Ochoa M, Yan P, Intes X. <a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6400960/">Net-FLICS: fast quantitative wide-field fluorescence lifetime imaging with compressed sensing - a deep learning approach.&nbsp;</a>Light Sci Appl. 2019; 8:26. Published 2019. doi:10.1038/s41377-019-0138-x</p>
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